public Rect DetectSoccerCourt(Mat img, ColorRange fieldMarkingsColor, int minBboxArea)
{
// Mask white lines (includes bars)
var lower = ClassicImageProcessor.HsvToScalar(fieldMarkingsColor.Lower);
var upper = ClassicImageProcessor.HsvToScalar(fieldMarkingsColor.Upper);
var threshImg = img.CvtColor(ColorConversionCodes.BGR2HSV)
.InRange(lower, upper);
// Find contours
threshImg.FindContours(out Point[][] contours, out HierarchyIndex[] hierarchy,
RetrievalModes.External, ContourApproximationModes.ApproxTC89L1);
// Get bboxes and filter out the small ones that are irrelevant
var boundingBoxes = ClassicImageProcessor.GetBoundingRects(contours)
.Where(rect => Area(rect) > minBboxArea);
// Get soccer court elements
var corners = GetCorners(boundingBoxes);
var touchlines = GetTouchlines(boundingBoxes);
var goals = GetGoals(boundingBoxes);
var halfWayLines = GetHalfWayLine(threshImg.Size(), boundingBoxes);
threshImg = threshImg.CvtColor(ColorConversionCodes.GRAY2BGR);
return(new Rect());
}
public Rect DetectBall(Mat img, ColorRange ballColor)
{
var lower = ClassicImageProcessor.HsvToScalar(ballColor.Lower);
var upper = ClassicImageProcessor.HsvToScalar(ballColor.Upper);
var threshImg = img
.CvtColor(ColorConversionCodes.BGR2HSV)
.InRange(lower, upper);
threshImg.FindContours(out Point[][] contours, out HierarchyIndex[] hierarchy,
RetrievalModes.External, ContourApproximationModes.ApproxTC89L1);
var ballRect = ClassicImageProcessor.GetBoundingRects(contours)
.OrderBy(rect => rect.Width * rect.Height)
.Last();
img.Rectangle(ballRect, new Scalar(255, 0, 0), 2);
return(ballRect);
}